First of all for those who are unaware, Apple Pay is Apple’s own version of near-field communication (NFC) which uses a dedicated chip to securely transmit data from a phone to a nearby (within inches) device. NFC has been in other phones for some time, but this is new territory for Apple. Basically, your credit card will be tied to an Apple Pay account (similar or connected to iTunes I suspect) so you can simply move your phone near a compatible credit card machine and accept the charge with your fingerprint.